Synthesis technology of spinel AlON

The high-purity AlON ceramics,AlON/Al2O3 and AlON/AlN multiphase ceramics were prepared by pressureless sintering under nitrogen-based atmosphere with raw materials of Al2O3,AlN and Al powders. The compositions of the phase were determined by XRD,the fracture appearance was analyzed by SEM. The results indicate:the aluminum oxynitride phase in the AlON ceramics and other multiphase ceramics exist in the form of Al5O6N,whose solid-solution zone is 33.4%(mole fraction) AlN belonging to spinel structures. The average grain size of high-purity AlON is about 3 μm. The grain boundary is smooth without other phases. The density is 2.82 g/cm3,the microhardness(10 N) and about bending strength are 1 470 MPa and 94 MPa,respectively.

The high-purity AION ceramics, AlON/Al2O3 and AION/AIN multiphase ceramics were prepared by pressureless sintering under nitrogen-based atmosphere with raw materials of Al2O3, AIN and AI powders. The compositions of the phase were determined by XRD, the fracture appearance was analyzed by SEM. The results indicate： the aluminum oxynitride phase in the AION ceramics and other multiphase ceramics exist in the form of Al5O6N, whose solid-solution zone is 33.4%（mole fraction） AIN belonging to spinel structures. The average grain size of high-purity A1ON is about 3 p.m. The grain boundary is smooth without other phases. The density is 2.82 g/cm^3, the microhardness （10 N） and about bending strength are 1 470 MPa and 94 MPa, respectively.